Retrieving & Clearing Diagnostic Trouble Codes
NOTE:
Before proceeding with diagnosis, certain precautions must be followed. See TROUBLE SHOOTING
.
- Connect scan tool to Data Link Connector (DLC). DLC is a 16-pin connector located on left side of steering column, above brake pedal. See Figure . Turn ignition switch to ON position. If scan tool display is not blank, go to next step. If scan tool display is blank, perform SCAN TOOL BLANK SCREEN under COMMUNICATIONS under SYSTEM TESTS.
- Using scan tool, select BODY SYSTEM, then BODY COMPUTER. Scan tool will perform a CCD bus test. If scan tool displays BUS OPERATIONAL, go to next step. If scan tool displays NO RESPONSE, perform appropriate test. See SYMPTOM IDENTIFICATION table. If scan tool displays any other message, perform appropriate test under COMMUNICATIONS under SYSTEM TESTS.
- Using scan tool, select READ DTCs. If any fault messages are displayed, see DIAGNOSTIC TROUBLE CODE DEFINITIONS table to identify which system is affected. If no fault messages are displayed, repair by symptom. See SYMPTOM IDENTIFICATION table for list of identified systems. Fault messages or symptoms are diagnosed using a scan tool and/or DVOM. These problems may occur separately or in various combinations. When diagnosing a system with many apparent problems, a sequence of tests may be required. After repairs, ensure problem(s) or failure(s) have been corrected by performing appropriate verification test. See VERIFICATION TESTS .
DIAGNOSTIC TROUBLE CODE DEFINITIONS
| Affected System (1) | Scan Tool Display | ||||
|---|---|---|---|---|---|
| Air Bag | (2) | ||||
| Communications | BUS (+) & BUS (-) SHORTED TOGETHER | ||||
| BUS BIAS LEVEL TOO LOW OR TOO HIGH | |||||
| BUS (+) &/OR BUS (-) OPEN | |||||
| SHORT TO 5 VOLTS FAILURE | |||||
| SHORT TO BATTERY FAILURE | |||||
| SHORT TO GROUND FAILURE | |||||
| NO BUS BIAS FAILURE | |||||
| NO TERMINATION FAILURE | |||||
| Vehicle Theft Security System | ANTENNA FAILURE | ||||
| COP FAILURE | |||||
| EEPROM FAILURE | |||||
| INTERNAL FAULT | |||||
| RAM FAILURE | |||||
| SERIAL LINK INTERNAL FAILURE | |||||
| STACK OVERFLOW FAILURE | |||||
| PCM STATUS FAILURE | |||||
| ROLLING CODE FAILURE | |||||
| SERIAL LINK EXTERNAL FAILURE | |||||
| TRANSPONDER CRC FAILURE | |||||
| TRANSPONDER COMMUNICATION FAILURE | |||||
| TRANSPONDER ID MISMATCH | |||||
| TRANSPONDER RESPONSE MISMATCH | |||||
| VIN MISMATCH | |||||
|
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SYMPTOM IDENTIFICATION